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Seismic Retrofitting of Steel Frames with Buckling Restrained and Ordinary Concentrically Bracing Systems with Various Strain Hardening and Slenderness Ratios | ||
| Journal of Rehabilitation in Civil Engineering | ||
| مقاله 3، دوره 2، شماره 2 - شماره پیاپی 4، آبان 2014، صفحه 20-31 اصل مقاله (676.38 K) | ||
| شناسه دیجیتال (DOI): 10.22075/jrce.2014.205 | ||
| نویسندگان | ||
| Gholamreza Abdollahzadeh* 1؛ Heidar Farzi-Bashir2؛ Mohammadreza Banihashemi1 | ||
| 1Faculty of Civil Engineering, Babol University of Technology, PO Box 4714871167, Shariati St., Babol 484, Iran | ||
| 2Civil Engineering Department, University of Shomal, Amol, Iran | ||
| تاریخ دریافت: 02 تیر 1392، تاریخ بازنگری: 08 مهر 1393، تاریخ پذیرش: 30 مهر 1393 | ||
| چکیده | ||
| The present study assesses the seismic performance of steel moment resisting frames (SMFs) retrofitted with different bracing systems. Two structural configurations were utilized: ordinary concentrically braces (OCBFs), buckling-restrained braces (BRBFs). A 7-story and 18-story steel perimeter SMFs were designed with insufficient lateral stiffness to satisfy code drift limitations in high seismic hazard zone. The frames were then retrofitted with OCBFs with 30, 60, 90, 120 slenderness ratios and BRBFs. Inelastic time-history analyses have been carried out using OPENSEES software for strain hardening from 1 to 10 percent to assess the structural performance under earthquake ground motions. Inter story drifts were employed to compare the inelastic response of the retrofitted frames. It is shown that the distribution of maximum story drifts in the height of BRBFs is more uniform than OCBFs with various slenderness ratios and with increasing strain hardening, the inter story drift and P-∆ effects is decreased. In addition, normal buckling braces with low slenderness ratio behave similar to the BRBFs to control inter story drift, but the cycling behavior in dissipation the energy can’t be changed, and finally the suitable performance from BRBF can’t be obtained. | ||
| کلیدواژه‌ها | ||
| Buckling-restrained brace؛ Inter story drift؛ Strain hardening؛ Slenderness ratio | ||
| مراجع | ||
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